Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f210dc54b3338a1…

MALICIOUS

PDF

57.1 KB Created: 2021-06-02 23:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7d2669cbabf70a8ef6bd0e2fd3bb3a SHA-1: 10374fcc029aee423ebf940ab1f845e2e74057fc SHA-256: 1f210dc54b3338a1e3728d5f904610e38b84ad96d1c5e40bc1dead867502be37
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6420

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/pbw?utm_term=how+to+write+a+reference+letter+for+immigration+marriage+%2528with+sample%2529
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/vibevaxiponiwer_nuvem.pdf
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/koduve.pdf
    • https://dubasatipin.weebly.com/uploads/1/3/4/4/134459773/jefugumupo.pdf
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/c1bed7acdda64.pdf
    • https://valofapapedor.weebly.com/uploads/1/3/1/1/131164243/mupoxag_mojufedamufaji.pdf
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5fcc60f6ac7cd.pdf
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/440031c38b.pdf
    • https://kivuvuvilex.weebly.com/uploads/1/3/2/7/132741385/c2ce4.pdf
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5fd93f36b5b09.pdf
    • https://cdn-cms.f-static.net/uploads/4476437/normal_60222cf55021f.pdf
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/4244123.pdf
    • https://garimawenipasad.weebly.com/uploads/1/3/4/5/134595154/diwifegelezoduvixi.pdf
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/5c15eb14fd8.pdf
    • https://lulaxakopoto.weebly.com/uploads/1/3/4/3/134331182/roxev.pdf
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/fenep.pdf
    • https://terojejiw.weebly.com/uploads/1/3/5/3/135348369/5163475.pdf
    • https://bupiwiwokegiju.weebly.com/uploads/1/3/4/5/134598777/4e8b9abaceced.pdf
    • http://pupowivala.pbworks.com/f/fesuxanezidurijab.pdf
    • http://xifilipisi.pbworks.com/w/file/fetch/144414102/how_to_get_free_fire_advance_server.pdf
    • http://kalunagepigi.pbworks.com/w/file/fetch/144424902/bawanuvi.pdf
    • http://pezeliv.pbworks.com/w/file/fetch/144426630/22785686600.pdf